海水のビタミンB12に関する研究-III : B12の日時的変動及び湖水におけるB12含量の垂直分布

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The diurnal fluctuation of vitamin B12 in the sea water was studied. At three stations in the Kagoshima Bay (Fig. 1), the sea water was collected from the various depths at intervals of two hours for 12 or 24 hours, and the vitamin was determined by the microbiological method described in the previous papery1). As shown in Table 1, the diurnal fluctuation and vertical distribution was found to be very complicated, and no regular form could be found. The vertical distribution of vitamin B12 in the Lake Ikeda was also investigated (Fig. 2). The values ranged from 0 to 62.5 mγ per liter. In the upper layer (0-20m), the fluctuation was most remarkable and the concentration of vitamin B12 considerably varied according to the slight difference of the depth. On the other hand, in the lower layer, the variation was very slight. The relationship between the water temperature and the amount of the vitamin was discussed.
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